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Use of the ASTM Yo-Yo Elastic Rope Toy Tester
  • 2020-09-22 09:39:44

I. Prepare specimens:

Samples must be prepared prior to operation without defects.

Ii. Operation Steps:

1. Items to be confirmed before operation:

1.1 Confirm whether the power supply meets the requirements.

1.2 Confirm whether the instrument is firmly placed.

2. Specimen preparation and installation:

2.1 Sample preparation:

2.1.1 A few samples are randomly selected from a batch of samples for testing. The samples extracted shall be the non-defective ones that meet the requirements of the production process.

2.1.2 Make two mark lines 1 and 2 on both ends of the yo-yo elastic rope as shown in the figure below.

2.1.3 The extracted samples should be placed in a standard environment for more than 8h to achieve a balanced state.

ASTM Yo-Yo Elastic Rope Toy Tester

2.2 Sample installation

2.2.1 Take out the processed yo-yo sample, clamp the handheld end shown in the figure above with the clip, and align the edges of the jig with the no.2 marking line.

2.2.2 Pull the cotton thread from the cotton thread wheel, pass through the ring and ink box at the end of the wire column, and Pierce through the gap under the cover plate.

2.2.3 Pull the cotton thread from the bottom of the cover plate and tie its end to the marker line 1.

ASTM Yo-Yo Elastic Rope Toy Tester

3. Start the test:

3.1 Turn on the power and turn on the power switch.

3.2 Turn the speed regulating knob anticlockwise to the minimum.

3.3 Press the Start button to Start the test. Rotate the speed regulating knob clockwise and make the speed stable at 80r/min according to the speed value displayed on the speedometer.

3.4 After a period of time, determine that the yo-yo elastic rope has been stretched to its maximum, and press the Stop button to Stop the test.

3.5 Release the fixture, remove the sample and measure the length of the cotton thread, that is, the elongated length of the yo-yo after the test.Note the position of the cotton thread at the clamp when taking off the sample.

Iii. Decision of results

After completing the test according to the above steps, take off the sample and measure the length of cotton thread, that is, the elongated length after the yo-yo test.

1. If the length of the rope at full elongation is much less than or greater than 50cm (20in) during the rotation test, such as less than 40cm(16in) or greater than 60cm(24in), the exact length of the rope is not required to be measured.

2.According to the standard requirements, the rope length of toys whose end mass is more than 0.02kg(0.04lb) should be less than 50cm(20in) when rotated by 80r/min.


For more information about ASTM Yo-Yo Elastic Rope Toy Tester products, please contact us.

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